correct table name assigned to temporary table field:

 - correct table name shown in EXPLAIN Iindex reference)
 - pointer on freed memmory (reallocation of table name in reusing table entry) can't be used in EXPLAIN
(BUG#1584)

mysql-test/r/derived.result

@@ -215,3 +215,18 @@ ERROR 42000: You have an error in your SQL syntax.  Check the manual that corres
 insert into  (select * from t1) values (5);
 ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near '(select * from t1) values (5)' at line 1
 drop table t1;
+create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1)
+);
+insert into t1 VALUES(1,1,1), (2,2,1);
+select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
+count(*)
+2
+explain select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	<derived2>	ALL	NULL	NULL	NULL	NULL	2	
+1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	THEMAX.E2	1	Using where
+2	DERIVED	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+3	DEPENDENT SUBQUERY	B	ALL	NULL	NULL	NULL	NULL	2	Using where
+Warnings:
+Note	1275	Field or reference 'A.E2' of SELECT #3 was resolved in SELECT #2
+drop table t1;

mysql-test/r/subselect.result

@@ -1439,10 +1439,3 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	Using where
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	4	Using temporary; Using filesort
 drop table t2, t3;
-create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1)
-);
-insert into t1 VALUES(1,1,1), (2,2,1);
-select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
-count(*)
-2
-drop table t1;

mysql-test/t/derived.test

@@ -122,3 +122,13 @@ delete from (select * from t1);
 -- error 1064
 insert into  (select * from t1) values (5);
 drop table t1;
+
+#
+# deived tables with subquery inside all by one table
+#
+create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1)
+);
+insert into t1 VALUES(1,1,1), (2,2,1);
+select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
+explain select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
+drop table t1;

mysql-test/t/subselect.test

@@ -965,12 +965,3 @@ insert into t2 values (2,2), (2,1), (3,3), (3,1);
 select * from t3 where a > all (select max(b) from t2 group by a);
 explain select * from t3 where a > all (select max(b) from t2 group by a);
 drop table t2, t3;
-
-#
-# deived tables with subquery inside all by one table
-#
-create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1)
-);
-insert into t1 VALUES(1,1,1), (2,2,1);
-select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
-drop table t1;

sql/item.cc

@@ -272,11 +272,13 @@ Item_field::Item_field(Field *f) :Item_ident(NullS,f->table_name,f->field_name)
 }
 
 // Constructor need to process subselect with temporary tables (see Item)
-Item_field::Item_field(THD *thd, Item_field &item):
-  Item_ident(thd, item),
-  field(item.field),
-  result_field(item.result_field)
-{ collation.set(DERIVATION_IMPLICIT); }
+Item_field::Item_field(THD *thd, Item_field &item)
+  :Item_ident(thd, item),
+   field(item.field),
+   result_field(item.result_field)
+{
+  collation.set(DERIVATION_IMPLICIT);
+}
 
 void Item_field::set_field(Field *field_par)
 {

sql/sql_select.cc

@@ -4866,6 +4866,9 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
       recinfo->type=FIELD_NORMAL;
     if (!--hidden_field_count)
       null_count=(null_count+7) & ~7;		// move to next byte
+
+    // fix table name in field entry
+    field->table_name= table->table_name;
   }
 
   param->copy_field_end=copy;